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2. Centrex - Wikipedia

   en.wikipedia.org/wiki/Centrex

   Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises. [1] Centrex service was first installed in the early 1960s in New York's financial district by New York Telephone.

3. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   An IP PBX handles voice calls over the Internet Protocol (IP), bringing benefits for computer telephony integration (CTI). An IP-PBX can exist as physical hardware or can carry out its functions virtually, performing the call-routing activities of the traditional PBX or key system as a software system. The virtual version is also called a "Soft ...

4. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Bicom Systems IP PBX for telecoms; Brekeke PBX, SIP PBX for service providers and enterprises; Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified Communication Manager (CUCM) CommuniGate Pro, virtualized PBX for IP Centrex hosting, voicemail services, self-care, ... Comverse Technology softswitch, media applications, SIP ...

5. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   NEAX31 (Discrete Electronic CPU, 4-stage Crossbar switching fabric, PBX) NEAX12 (Analog / Digital Hybrid PBX) NEAX22 (Analog / Digital hybrid PBX) NEAX 2000/1000; NEAX2400 (Fully Digital PBX) XN120; NEC Univerge SL1000 (Small or Medium Sized, VoIP And TDM) Enterprise IP Systems NEC Univerge SV7000 (Fully IP, VoIP and TDM) Pure IP Communication ...

6. Lumos Networks Expands IP Centrex Product Line With ... - AOL

   www.aol.com/2013/02/06/lumos-networks-expands-ip...

   Lumos Networks Expands IP Centrex Product Line With Business Communicator WAYNESBORO, Va.--(BUSINESS WIRE)-- Lumos Networks (NAS: LMOS) , a leading provider of fiber-based products across the Mid ...

7. Extension (telephone) - Wikipedia

   en.wikipedia.org/wiki/Extension_(telephone)

   In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...